Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bef794565d728bb…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 12:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a8c6eb0ac94bbc0a4daba8b783ff15e SHA-1: 01a708d5793f288df9d03649d6af834794aeb3f6 SHA-256: 1bef794565d728bb521819dda9868d298bebfedb86db46603ccc0bbb365a3733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, combined with the heuristic firings, strongly suggests this document is a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nuitsdartistes.eu/images/file/gunitawuroxuwu.pdf In PDF document text
    • http://matkinhantai.com/luutru/files/62563531775.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/2610741434.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/81885261317.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c22fc97b6a---48555282920.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/55358284250.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6efm0bba4ojcep3v4qedr3vkfa/fazugoni.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/87393500941.pdfIn PDF document text
    • https://okvino.it/file/29175540277.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2edefc0579---99871223362.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210830021951.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/4087511752.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vomawaje.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wowivobowi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/71461291625.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/17879522496.pdfIn PDF document text
    • http://haai.org/upload/file/buvogexugutapajilavupek.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donedololadunexuwarix.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/87796772309.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/78134882217.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/tekob.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/givigofepetisigotep.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/11268035759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=acculink+platinum+1050+installation+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 18032 bytes
SHA-256: f91f4e089b00770e987c133faee16f28dbdf4e5210e6674d5e2d1b253ece653c
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10784 bytes
SHA-256: ce381df9ae62c88e20d36574d6cfbaa488856f9af59c55504284eb03c4c37a71
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1